I have a VC vigilant. This is my third year with this stove. I have never had a problem with it the first two years. It ran great, heats my whole house. I started burning this year around November and the stove ran perfectly as usual. As we got into late January/early February I began to notice a lack of draft when we would load the stove. Normally when you open the stove to add wood (it is a top loader) not a single drop of smoke would escape. You would see the smoke getting literally sucked up the chimney. Now, when we load the stove, smoke pours out of the load door and into the room and I even see smoke coming out the air control flap and the seams in the stove pipe before the chimney turns to class A pipe, usually when it is windy. I have a quality stack, Simpson dura-vent, 8" pipe all the way up. What I do not understand is I have always had killer draft. What has changed???? I checked the entire stack and it is crystal clear. I ran my brush through any way just to be sure. I disassembled the interior sections to check for blockage and everything is super clear. I used to be able to light a piece of newspaper and hold it in the stove near the flu opening and you would just see the smoke/ash literally getting super sucked right up the stack. Now if I do that, it barely gets sucked up at all. Because the stack is clear and clean, is there a problem with my stove??? Also, there have been no changes to construction of my home ( or surrounding homes), no new windows or anything that would increase 'tightness' of my house. HEEEELLLLPPPPPPPP! Oh yeah, stove is an early style vigilant, no catalytic element. Just a plane jane johnny.